MFC Fins KAI XXL R2 QUAD SETKAI XXL R2 QUAD SET This is the new concept from Kai Lenny and MFC Hawaii. We search for more speed and control on Big Surf. We finally came up with the right combination in between profiles on rear and front fins, together with outlines and composites construction. The rear fins are bigger sizes then the front fins. The profiles are 80 20 and the construction is full carbon composites to control flexibility and torsion of this fin set. In this size